The drum circle, or Tam Tams, at the George-Étienne Cartier Monument in Mount Royal Park, Montreal, attracts a wide range of people. It's less "hippie" and more "carnival" than most drum circles I've experienced. Starts around 1pm on summer sundays.
The free event gathers thousands of drum players, dancers, vendors, and people who are relaxing, tanning, juggling and playing frisbee.